Micrometer.



Z. B. GOES. MIGROMETER. APPLICATION FILED .umzs. 1914.

Patented Mar. 23, 1915.

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THE NORRIS PETERS 60.. PHoTo-bITH'a, WASHINGTON, D. r

ZORESTER B. cons, or PHILADELPHIA, rnlv vsvizvanra.

MICROMETER.

Specification of Letters Patent. P t t d M '23 1915;

Application filed August 28, 1914. Seria1No.859,007.

To all whom it may concern Be it knownthat I, ZoREsrER B. Cons, a

citizen of the United States, residing in the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain Improvementsin Micrometers, of which the following is aspecification.

My invention is designed to provide-a simple, sensitive, accurate and dust proof micrometer, comprising mechanism having but slight and constant frictional resistance (as distinguished from mechanism operated through cams or other devices having variable resistances), which can be directly read without requiring interpolation.

Characteristic features of my improvements will more fully appear from the following description and the accompanying drawings in illustration thereof.

In the drawings, Figure 1 is a side elevation of a preferred form of instrument embodying my improvements; Fig. 2 is an enlarged longitudinal sectional view of a portion of the instrument taken on the line m:r of Fig. 1; Fig. 3 is a part sectional side elevation of a modified form of instrument embodying my improvements;

and Fig. 4 is a transverse sectional view on line y-y of Fig. 2.

As shown in Figs. 1, 2, and 4: of the drawings, the yoke 1 is provided with the usual anvil 2 fixed to one leg and has the hollow cylinder 3 projecting from the other leg thereof, the cylinder having fixed therein the interiorly and exteriorly threaded-feed nut at. A barrel 5, sleeved on the cylinder 3, contains the concentric screw 6 and is provided with a knurled head 7, the screw having a section 6 journaled in the bearing 1 of the yoke and a threaded section which engages the threads of the feed nut.

The feed nut 1 and screw 7 are provided with threads sufficiently close (preferably 4O to the inch) to gradually advance the screw 7 upon the rotation of the head, and the inner end of the barrel 5 is graduated (preferably into 25 parts) to indicate, in connection with the pointer 3' on the cylinder 3, fractional revolutions of the barrel.

It will be understood that when the screw is provided with 40 threads to the inch and the barrel with 25 graduations, each graduation of the barrel will indicate a move ment of the screw .001 of an inch. A casing 8, fixed to the yoke, incloses the cylinder 3 and the forward end of the barrel 5, and has screwed into thejenlargedirear end thereof I an apertured cap 9 through which the barrel is movable, the packing 10 preventing ingress of dust or other foreign matter be tween the barrel and cap.

A bearing 11', having the feather 12 engaged in the spline 5 of the barrel 5, is.

housed within the casing and has projecting therefrom the diametricallydisposed studs 13 on which are journaled" planet pinions 14 which engage the internally toothed ring 15 fixed in the casing and the sun pinion 15 ournaled on the barrel 5. The pinion 15 1s provided with teeth or lugs 16 which engage notches 17 of and rotate the first index ring 17 of usual odometer mechanism. This index ring is provided with a stud 18 which, on each revolution of the ring, engages the pinion 19 and therethrough advances the next index ring 20 one step, the pinion 19 being loosely journaled on the shaft 21 fixed in the bearings 22 and 23 of the casing. The index ring 20 acts similarly through its stud 2 1 and the pinion 25 journaled on the shaft 21 to advance the index ring 26 one step for each revolution of the index wheel 20.

The ratios of the gears through which the movement of the screw is transmittedto the index rings are proportioned to the number of the screws threads per inch, as, for example, when the screw has 10 threads to the inch the gears will be so proportioned that one complete revolution of the barrel 5 will of the spindle or screw 7. The casing is provided with suitably covered sight apertures 27 and 28 through which readings may be made.

As shown in Fig. 3, the odometer casing is fixed to the yoke below the barrel 5, which drives the register through the gear 29 splined on the barrel, the gear 29 meshing with a gear 30 having an arbor 31 journaled in the casing. The gear 30 has integrally formed therewith a disk 32 provided with lugs 33 engaging the first wheel of the odometer, which acts through mechanism similar to that shown inFigs. 2 and 1 to drive the remaining-index ring.

Having described my invention, I claim:

1. A micrometer comprising a cylinder, a screw threaded in said cylinder, a sleeve fixed to said screw and inclosing said cylinder, index wheels operated by said sleeve, and a casing surrounding said sleeve and inclosing said wheels.

2. A micrometer comprising a screw, a barrel connected with said screw, a member revoluble by and movable longitudinally on said barrel, and registering mechanism 0p- -erated by said member. a

3. A micrometer comprising a screw, a device movable along and revoluble by said screw, planetary gearing operated by said device, and a register mechanism operated by said gearing.

4. A micrometer comprising a barrel pro- Copies of this patent may be obtained for vided with graduations, a screw fixed in said barrel, a device on said barrel and revoluble therewith, said barrel being movable longitudinally relatively to said device by said screw, a gear operated by said device proportionately to the movement of said screw, and revoluble index wheels operated by said gear.

In testimony whereof, I have vhereunto set my name this 18th day of August, 1914, in the presence of the subscribing witnesses.

ZORESTER- B. GOES.

Witnesses:

Jos. Gr. DENNY, Jr., C. N. BUTLER.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

